Thomas Mammoser holds a BA in philosophy from the University of Notre Dame, and pursued his graduate studies in philosophy at both Loyola University and the University of Chicago. For his career, Mammoser served for many years as Walgreens' director of corporate communications, specializing in public and media relations, executive speech writing, and internal and external communications. Under his guidance, his staff's publications won many regional and national awards of excellence.
Mammoser also developed the acclaimed One-on-One mentoring program that pairs young professional adult mentors with Chicago's inner-city youth. He now serves as the vice president of the Midtown Educational Foundation, which has offered the program since 1989.
Over the years, Mammoser has also taught courses at the University of Santa Croce in Rome on communications, culture, and the church. He is currently writing on various subjects related to the Christianization of modern culture.